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  1. 10-3 nm/ppm was achieved using SI and FP interferometer respectively. Karthik et al. used FP interferometer integrated with μ GC and detected toluene down to 25 ppb [9]. Kacik et al. developed optical fiber sensor by using a micro cavity in PDMS and detected toluene with a sensitivity of 0.15 nm/g-m-3 [10]. In this study we investigated Mach ...
  2. academia.edu

    Heterodyne Interferometry for Detection of Toluene using PDMS as a Sensing Film . × Close Log In. Log in with Facebook Log in with Google. or. Email. Password. Remember me on this computer. or reset password. Enter the email address you signed up with and we'll email you a reset link. ...
  3. academia.edu

    This study investigates the use of a heterodyne interferometer configured with a polydimethylsiloxane (PDMS) sensing film for the detection of airborne toluene at sub-ppb levels. By analyzing changes in phase and height of the PDMS film upon adsorption of toluene, the system aims to achieve high sensitivity and precision in measuring VOC ...
  4. scholar.google.com

    P1OS. 11-Study on Absorption of VOCs into PDMS Film using Heterodyne Interferometry for Application of VOCs Sensing. ... Heterodyne Interferometry for Detection of Toluene using PDMS as a Sensing Film. ... 3rd international workshop MIGRATE, 2018. 2018: ePiezoInk: Biocompatible piezoelectric inks for printed sensors. E Lemaire, S Khan, C de ...
  5. A heterodyne interferometer using a Mach-Zehnder optical configuration is designed for detection of airborne VOCs. The design is based on film-mediated sensing technique in which the response of intermediate sensing film is monitored using interferometry. PDMS is used as a sensing film, which
  6. semanticscholar.org

    Chemical sensors Study on Absorption of VOCs into PDMS Film using Heterodyne Interferometry for Application of VOCs Sensing. ... A heterodyne interferometer using a Mach-Zehnder optical configuration is designed for detection of airborne VOCs. The design is based on film-mediated sensing technique in which the response of … Expand.
  7. Different concentrations of toluene were generated using nitrogen and toluene cylinders (100 ppm ± 2%, Air Products, France) connected with mass flow controllers (Bronkhorst, Netherland) with a full-scale range of 20ml/min±0.5% and 10 ml/min±0.5% respectively. The data were acquired using a custom script at a
  8. sciencedirect.com

    A detection limit down to 28 ppb was demonstrated for toluene using FP interferometer coupled ... Humidity has a negative effect on both the sensitivity and response rate of the sensing film. The adsorbed H 2 O into PDMS or zeolite reduces the diffusion rate of VOCs into the sensing film. For a durable sensor, suitable and robust packaging is ...
  9. ama-science.org

    PDMS is used as a sensing film, which changes its volume and refractive index when absorbed VOCs molecules. Thin film of PDMS acts as a phase object and any variation in its state causes a proportional phase shifts in the transmitted light beam. The Mach-Zehnder interferometer is integrated with a microscope and acoustic-optic modulators.

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